<template>
    <div>
      <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>商品分类</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图 -->
      <el-card>
        <el-row>
          <el-col>
            <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
          </el-col>
        </el-row>

        <!-- 表格 -->
        <tree-table  class="treeTable" :data="catelist" :columns="columns" :selection-type="false"
        :expand-type="false" show-index index-text="#" border :show-row-hover="false">
          <!-- 是否有效 -->
          <template slot="isok" slot-scope="scope">
            <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen;"></i>
            <i class="el-icon-error" v-else style="color: red;"></i>
          </template>
          <!-- 排序 -->
          <template slot="order" slot-scope="scope">
            <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
            <el-tag size="mini" type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
            <el-tag size="mini" type="warning" v-else>三级</el-tag>
          </template>
          <!-- 操作 -->
          <template slot="opt" slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.cat_id)">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeCate(scope.row.cat_id)">删除</el-button>
          </template>
        </tree-table>
        <!-- 分页区域 -->
        <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum" :page-sizes="[3, 5, 10, 15]" :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper" :total="total">
        </el-pagination>
      </el-card>

      <!-- 添加分类的对话框 -->
      <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%"
      @close="addCateDialogClosed">
        <!-- 添加分类的表单 -->
        <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
          <el-form-item label="分类名称：" prop="cat_name">
            <el-input v-model="addCateForm.cat_name"></el-input>
          </el-form-item>
          <el-form-item label="父级名称：">
            <el-cascader expand-trigger="hover" v-model="selectedKeys" :options="parentCateList"
            :props="cascaderProps" @change="parentCateChanged" clearable>
            </el-cascader>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
      </el-dialog>

      <!-- 修改分类的对话框 -->
      <el-dialog title="修改分类" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
        <!-- 修改分类的表单 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
          <el-form-item label="分类名称" prop="cat_name">
            <el-input v-model="editForm.cat_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editCate">确 定</el-button>
        </span>
      </el-dialog>
    </div>
</template>

<script>
export default {
  data() {
    return {
      queryInfo: {
        type: 3,
        pagenum: 3,
        pagesize: 5
      },
      catelist: [],
      total: 0,
      columns: [{
        label: '分类名称',
        prop: 'cat_name'
      }, {
        label: '是否有效',
        type: 'template',
        template: 'isok'
      },
      {
        label: '排序',
        type: 'template',
        template: 'order'
      },
      {
        label: '操作',
        type: 'template',
        template: 'opt'
      }
      ],
      addCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      parentCateList: [],
      cascaderProps:
      {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        checkStrictly: 'true'
      },
      selectedKeys: [],
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        cat_name: [
          {
            required: true, message: '请输入分类名称', trigger: 'blur'
          }
        ]
      }

    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败!')
      this.catelist = res.data.result
      this.total = res.data.total
    },
    // 监听 pagesize 改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听 pagenum 改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    // 点击按钮，展示添加分类的对话框
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) return this.$message.error('获取父级分类数据失败!')
      console.log(res.data)
      this.parentCateList = res.data
    },
    // 选择项发生变化触发这个函数
    parentCateChanged() {
      console.log(this.selectedKeys)
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        return 0
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 点击按钮，添加新的分类
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return 0
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) return this.$message.error('添加分类失败!')
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    // 点击按钮，修改分类信息
    editCate() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return 0
        const { data: res } = await this.$http.put(`categories/${this.editForm.cat_id}`, {
          cat_name: this.editForm.cat_name
        })
        if (res.meta.status !== 200) return this.$message.error('修改分类失败!')
        this.$message.success('修改分类成功!')
        this.getCateList()
        this.editDialogVisible = false
      })
    },
    // 点击按钮，修改分类信息

    // 监听对话框的关闭事件，重置表单数据
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
    // 点击按钮，展开修改的对话框
    async showEditDialog(Id) {
      const { data: res } = await this.$http.get(`categories/${Id}`)
      if (res.meta.status !== 200) return this.$message.error('获取分类信息失败!')
      this.editForm = res.data
      this.editDialogVisible = true
      console.log(this.editForm)
    },
    // 根据Id删除对应的分类项
    async removeCate(Id) {
      const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') return this.$message.info('已取消删除!')
      const { data: res } = await this.$http.delete(`categories/${Id}`)
      if (res.meta.status !== 200) return this.$message.error('删除分类失败!')
      this.$message.success('删除分类成功!')
      this.getCateList()
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    }
  }
}
</script>

<style lang="less" scoped>
.treeTable {
    margin-top: 15px;
}
.el-cascader {
    width: 100%;
}
</style>
